/*
 * MIT License
 *
 * Copyright (c) 2010 - 2021 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package oshi.util;

import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;

import oshi.annotation.concurrent.ThreadSafe;

/**
 * General constants used in multiple classes
 */
@ThreadSafe
public final class Constants {

    /**
     * String to report for unknown information
     */
    public static final String UNKNOWN = "unknown";

    /**
     * The official/approved path for sysfs information. Note: /sys/class/dmi/id
     * symlinks here
     */
    public static final String SYSFS_SERIAL_PATH = "/sys/devices/virtual/dmi/id/";

    /**
     * The Unix Epoch, a default value when WMI DateTime queries return no value.
     */
    public static final OffsetDateTime UNIX_EPOCH = OffsetDateTime.ofInstant(Instant.EPOCH, ZoneOffset.UTC);

    /**
     * Everything in this class is static, never instantiate it
     */
    private Constants() {
        throw new AssertionError();
    }
}
